The Basque weather agency Euskalmet expects Monday 21 September 2026 to be Basque Country mostly clear, with a slight rise in temperatures. Mist and fog are possible locally in the early hours, generally clearing during the morning. Low cloud may appear at times along the coast, but overall it will remain fine and dry.
According to the announcement, reported on Sunday by Europa Press , daytime highs are expected to be slightly above those of recent days. Around 23 to 25 degrees are forecast along the coast, with temperatures possibly a little higher in some inland areas. Light to moderate winds will turn northerly to north-easterly during the day. Rain is unlikely; humidity will be high in the morning and will fall as temperatures rise.
The conditions are consistent with a stable early-autumn pattern, with high pressure over the northern Iberian Peninsula. Typical features include ground and valley fog in the early hours, particularly in low-lying areas and river valleys, followed by rapid clearing in the late morning. Along the Cantabrian coast, cloud may linger a little longer due to onshore winds, without bringing any significant rain.
For cities such as Bilbao, San Sebastián and Vitoria-Gasteiz this means patches of reduced visibility due to fog or mist in the morning, followed by sunny spells and mild to warm temperatures during the day. Road users should expect brief periods of reduced visibility in the early hours. Only minor effects are expected in agriculture; soils will continue to dry out during the day.
Euskalmet is the Basque Country’s responsible weather authority. Supplementary nationwide forecasts from the State Meteorological Agency AEMET point to generally settled, dry and slightly warmer weather in northern Spain over the same period. As short-term forecasts are affected by changes in pressure patterns and sea breezes, there may be minor variations in cloud cover and daytime highs.
The information available is based on the announcement published on 20 September 2026, in which Euskalmet outlined the outlook for Monday. A sustained change in the weather is therefore not initially in sight; stable, dry conditions with slightly higher temperatures are expected to continue in the days that follow.
Editor: Andreas M. Brucker (Article created with AI assistance).